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Insulation question

Last night I built a new hammock stand because I have no trees in my yard. I wanted to try out my new underquilt because the temp was going to get down to fourty degrees, which would be the coldest temp I've hung in. I got the underquilt to fit nicely and just used a thirty degree sleeping bag as a top quilt. My problem was that throughout the night I would randomly wake up with the chills. At the same time though I could definitely feel the warmth from below. So I'm assuming I was getting chilled from above. What do you guys think? The temp is supposed be the same tonight so I want to change some things and try again. Could the answer be as simple as a stocking cap?

Make sure the UQ is snugged up against your back/butt. And you may need to have someone look to make sure there are no openings on the ends- while you are in it- which will allow cold air to rush in under even a tiny gap.

Could you tell if you were cold over all or on top, or did you specifically feel cold on your back or butt? Which, if you did, can make you cold all over also. But if you felt a cold back, that will tell you a lot about what you need to do.

Is you bag down or synthetic? Older synthetic bags are famous for losing some loft, though it can happen with any older bag. Are you normally warm in this bag at these temps when sleeping on the ground? If so, more evidence pointing to an UQ out of adjustment.

Big possibility: when I first started using a bag as a TQ, I had quite a few cold nights where I became instantly warm just by getting in the synthetic bag and zipping it up and using the hood/neck collar. This was a learning curve for me, overcoming a tendency towards drafts around the neck and shoulder, or really anywhere along the length of a quilt. I do fine these days, but any drafte must be 100% dealt with if you hope to approach the temp rating of a sleeping bag, TQ or UQ.

Next: head insulation is a must. Especially when going from sleeping in a mummy bag to using that bag as a TQ. When you bypass that bags thick, draft free hood/neck collar, you give up a huge hunk of it's rated warmth.

Apparently, signature that I used from 2006 no longer tolerated so now deleted.

Make sure the UQ is snugged up against your back/butt. And you may need to have someone look to make sure there are no openings on the ends- while you are in it- which will allow cold air to rush in under even a tiny gap.

Could you tell if you were cold over all or on top, or did you specifically feel cold on your back or butt? Which, if you did, can make you cold all over also. But if you felt a cold back, that will tell you a lot about what you need to do.

Is you bag down or synthetic? Older synthetic bags are famous for losing some loft, though it can happen with any older bag. Are you normally warm in this bag at these temps when sleeping on the ground? If so, more evidence pointing to an UQ out of adjustment.

Big possibility: when I first started using a bag as a TQ, I had quite a few cold nights where I became instantly warm just by getting in the synthetic bag and zipping it up and using the hood/neck collar. This was a learning curve for me, overcoming a tendency towards drafts around the neck and shoulder, or really anywhere along the length of a quilt. I do fine these days, but any drafte must be 100% dealt with if you hope to approach the temp rating of a sleeping bag, TQ or UQ.

Next: head insulation is a must. Especially when going from sleeping in a mummy bag to using that bag as a TQ. When you bypass that bags thick, draft free hood/neck collar, you give up a huge hunk of it's rated warmth.

I do believe the underquilt was properly adjusted and snug against the bottom of the hammock. I have slept fine on the ground with this sleeping bag and a pad at lower temps. It is an older synthetic mummy style bag though. The more I think about the head and shoulder area not being covered the more I think it could have been the problem.